12 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. CYLLOPODID.E. 



The first pair of antennce (PI. I, fig. 4, 4 a, and 5) in the male are of the same form 

 as in Cyllopus levis, but the basal joint of the peduncle is much stouter and larger, three 

 times longer than the two following joints together, the narrow cylindrical part of the first 

 flagellar joint is shorter than the tumid basal part together with the whole peduncle. The 

 first joint of the flagellum is followed by two minute joints, the last half as long as the 

 preceding, tipped with a bundle of hairs. The tumid, conical part of the first joint is 

 provided with a mass of long, slender, cylindrical olfactory bristles, placed on depressed 

 buttons or desks on the inner lower side of the joint. In the female (PI. I, fig. 6) the 

 first flagellar joint is much thicker, and the cylindrical portion much shorter. The whole 

 length of the antennae of the female is shorter, not equalling the length of the head; in the 

 male longer than the head and the first two pereional segments together. 



The second pair of antenna' (PL I, fig. 7 and 8) are six-jointed, the first joint is 

 the shortest, but thick and stout; the second joint is a little longer; the third as long 

 as the two preceding together; the fourth joint, twice as long as the third, is as long as 

 all the three preceding together; the fifth is a little shorter than half the fourth; the sixth 

 is as long as the fifth. The upper margin of all the joints is undulated, each undulation 

 carrying a pair of short sharppointed bristles. The inferior margin is straight provided 

 with single, equidistant short spines. The end of the sixth joint is tipped with a bundle 

 of bristles. The last three joints are much narrower than the preceding, linear. 



The mouth-organs are well developed. 



The labrum (PI. I, fig. 9) is almost as long as broad, rounded at the free hinder 

 margin and deeply incised, the both lobes thus formed are densely hirsute. 



The mandibles (PI. XI, fig. 10 — 13) have a stout basal portion, the lower end forms 

 a broad strong molar tubercle, the grinding surface is like that in the Vibiiice, consisting 

 of parallel, feebly curved, prominent rolls, the Avhole surface surrounded by long, strong, 

 sharp spines (PI. I, fig. 11). At the inner side of the molar tubercle in the left mandible 

 project two broad cutting processes, bluntly serrated at the loAver margins, in the right 

 mandible there is only one. (PI. I, fig. 12). At the base of this process is a mass of 

 slender hairs. At the middle of the outer side of the mandible arises the mighty palp, 

 the basal joint is the shortest, the second is the longest and stoutest, the last joint is 

 evenly tapering, the end strongly curved, provided with slender hairs (PI. I, fig. 13). 



The first pair of maxilla? (PI. I, fig. 14 and 15) have the basal portion stout, 

 linear; the inner lamina is tipped with four or five strong, feebly curved spines; the outer 

 lamina is curved, tapering toward the end, fringed with slender hairs. 



The second pair of maxillce (PI. I, fig. 16 and 17) are small, curved, the loAver end 

 forming two rounded processes provided with short hairs. 



The maxillipeds (PI. I, fig. 18 and 19) consist of a broad basal portion, a broad 

 thick median lobe, feebly rounded below and projecting inwards, and two stout lateral lobes; 

 these are straight along the inner margin and complexly serrated. The serration consists 

 namely of a row of broad, strong teeth; each tooth showing two to four sharp points. 

 At the inner side of each lobe there is a row of short spines. The outer margins of the 

 lateral lobes are strongly curved. 



